It is designed to do so. Everliker wakes up, makes a few likes and goes to sleep. It will also sleep at night for 8 hours.
It should however consistently deliver the daily quota of likes given that PC is on and connected to Internet for long enough.
If there is no posts for a tag, Everliker will ban the tag from 2 to 24 hours from being run in hope there will be more posts soon.
Realistically this should not slow you down unless you use just one or two tags with a very low number of posts created.
Everliker also won’t be unliking posts automatically as it’s not a natural behaviour.